User Manual

4 Data flow

All process values (variables) together with their addresses, data type

and access mode are described below.

References are as follows:

R/O read access only

R/W read and write access

char, byte byte (8 bits)

int integer (16 bits)

Bit x bit No. x

long long integer (4 bytes)

float float value (4 bytes) according to IEEE 754

Byte sequence Because of the platform-dependent representation of floating-point

numbers and long values, the bytes must be arranged in the sequence

that is appropriate for MODbus.

Please find out in which sequence float values are stored in your system

(PC, PLC etc.).

Single-float format (32bit) according to the IEEE 754 standard

S - sign bit

E - exponent (complement to base 2)

M - 23bit normalized mantissa

MODbus float format

The RS422/485 interface is inactive during communication

via the setup interface.

SEEEEEEE EMMMMMMM MMMMMMMM MMMMMMMM

MODbus address x MODbus address x+1

MMMMMMMM MMMMMMMM SEEEEEEE EMMMMMMM